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The Precise Radius of the Inner Core Was Not Measured

Question 80
Multiple Choice

The precise radius of the inner core was not measured until relatively recently.How was this accomplished? A)by finding the S-wave shadow zone beyond 105° B)by Neil Armstrong conducting hammer seismic experiments during a 1960's Apollo Mission C)by using a precisely known, underground nuclear weapons test in the Nevada desert in the early 1960s D)by measuring the edge of the P-wave shadow zone from the great Chilean earthquake of 1960

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Q 81
The fact that ________ is good evidence for a solid inner core. A)P waves are faster in the inner core than in the outer core B)S waves do not pass directly through the core C)S waves are slower in the inner core than in the outer core D)S waves are focused at the centre of the P-wave shadow zone
Q 82
Earthquakes result from the sudden release of elastic strain energy previously stored in rocks surrounding a zone of fault movement.
Q 83
The epicentre of an earthquake is on the surface of the Earth directly above the hypocentre.
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